| http://www.w3.org/ns/prov#value | - In particular, without information on tumor stage, Gleason score, PSA, and other factors used to risk stratify cancer patients, we were not able to determine if the disease severity of patients treated with prostatectomy changed over time.Similarly, we were not able to examine how centralization, the introduction of robotics, and travel influenced the relative frequency with which surgery, active
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